Ocyptamus gastrostactus
(Wiedemann, 1830)
Spotted Hover Fly
Ocyptamus gastrostactus is a predatory hover fly in the Syrphidae. Its larvae are specialized of aphids, with documented on Sarucallis kahawaluokalani on Lagerstroemia indica in Panama. The serves as a for the Pachyneuron albutius, which parasitizes its pupae. It is widely distributed across Brazil and has been recorded in Panama.
Pronunciation
How to pronounce Ocyptamus gastrostactus: /oʊˈsɪptəməs ɡæstrəˈstæktəs/
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Habitat
Associated with plants infested with colonies, particularly Lagerstroemia indica (Lythraceae).
Distribution
Brazil (widespread across 26 states including Acre, Amazonas, Bahia, São Paulo, and others); Panama.
Diet
Aphids; specifically documented on Sarucallis kahawaluokalani (Aphididae).
Host Associations
- Sarucallis kahawaluokalani - prey/food source preyed upon by larvae
- Lagerstroemia indica - plant of prey aphids
- Pachyneuron albutius - Parasitizes pupae of O. gastrostactus
Behavior
Larvae actively prey on aphids, seizing them and consuming their contents.
Ecological Role
agent through ; also serves as for in .
Human Relevance
Potential biocontrol agent for pest management.
Similar Taxa
- Episyrphus balteatusSimilar abdominal banding pattern; distinguished by secondary 'moustache'-like black bands on 3rd and 4th in E. balteatus, which is restricted to the Old World.
- Pseudodoros clavatusSimilar -mimicking appearance and aphidophagous larvae; Ocyptamus have at least faint dark markings on wings (such as bold leading edge), while Pseudodoros lacks these wing markings.
- ToxomerusSimilar small size and general syrphine appearance; Ocyptamus distinguished by wing markings and abdominal patterning.
- AllograptaSimilar overall ; requires examination of thoracic characters for reliable separation.
- BacchaSimilar slender build; at least one Baccha has distinctly banded , and wing venation differs.